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<?php /* A very simple implementation of 'typed array', like this: $stringArray = new TypedArray('string'); and now only strings can be added to the above $stringArray. Works with objects as well. More examples below. */ class TypedArray extends \ArrayIterator { protected $type = ''; public function __construct(string $type, array $input = [], int $flags = 0){ $this->type = $type; parent::__construct($input, $flags); } /* Just an utility funciton. In case it's a scalar (like int), or array etc - returns that if it's an object, returns the name of the class. */ public function getTypeOrClassName($val){ $testType = gettype($val); if($testType === 'object'){ return get_class($val); } return $testType; } public function checkType($val){ return $this->getTypeOrClassName($val) === $this->type; } public function getType(){ return $this->type; } public function offsetSet($offset, $value) { if(!$this->checkType($value)){ throw new \InvalidArgumentException('This TypedArray accepts only "' . $this->type . '" type, "' . $this->getTypeOrClassName($value) . '" given'); } return parent::offsetSet($offset, $value); } } ////////////////////////////////////////////////////////////////////////////// //examples $stringArray = new TypedArray('string'); $stringArray []= 'first string'; $stringArray []= 'second string'; //$stringArray [] = 2;//won't work - exception thrown var_dump((array)$stringArray); //tests with objects as values class User{ public $name; public function __construct($name){ $this->name = $name; } } $userArray = new TypedArray(User::class); $userArray[]= new User('John'); //$userArray []= new \StdClass();//exception thrown echo $userArray[0]->name;